How do eye trackers work?
The process of eye tracking is, from a technical point of view, divided into two different parts: registering the eye movements and presenting them to the user in a meaningful way. While the eye tracker records the eye movements sample by sample, the software running on the computer is responsible for interpreting the fixations within the data. This blogpost aims at explaining the principles used in Tobii Eye Trackers in order to track the participant’s eye movements. Pupil Centre Corneal Reflection technique (PCCR) A light source is used to cause reflection patterns on the cornea and pupil of the test person. A camera will then be used to capture an image of the eye. The direction of the gaze is then calculated using the angles and distances.
